Tire-deflation signal



w. L. GALBRAITH v'1,773,394 A Aug. 191, A1930,A4

` I TIRE DEFLATIQN SIGNAL v Filed Feb. 27, 1929 A tlrr'ley I Patented Aug. 19,1930

, ture, leakage,

WARREN L. GALBRAITH, OF DEER PARK, VASHINGTON, ASSIGNOR OFONE-FO'URTH TO ALBERT H. TAYLOR, .ALL OF SPOKANE,

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Application feed February a7, ieee.E

My present invention relates to an improved tire deflation signal of the type adapted for use with vehicles, and involving means for giving warning by an audible signal, as a whistle, when the pressure within the pneumatic tube or pneumatic tire of an automobile wheel, is reducedbelow a normal, predetermined pressure, either by puncor otherwise.

The device of my invention is adapted for y use with the standard types of tire valve defor the customary vices now in use on ypneumatic tires and it may readily and with facility be substituted cap employed to close the exteriorly threaded valve tube of the tire.

The `invention consists in certain novel combinations and arrangements in the signal device, including a signal valve that is held normally closed by the air pressure of the tire, ,which is automatically opened if andl when the pressure in the tire reaches a predetermined minimum, and means are provided whereby air pressure past the opened valve will sound the audible signal or whistle n as a warning.

In theV accompanying drawings I'have illustrated one complete example of the physical embodiment of my invention wherein t-he parts are combined and arranged according to one mode I have thus far devised for the practical ap lication of the principles of invention. igure l is a view showing the device in use.

Figure 2 is a longitudinal sectional view of the signal device as applied to a tire valve. Figure 3 is an enlarged, detail, sectional view of the signal valve. sectional view at line 4-4 of Figure 2.

To illustrate the utility of the signal device and its relationV to the pneumatic tube of a tire Ihave shown such a tube as l in Figure l, provided with the usual air valve device that includes the exteriorly Vthreaded valve sleeve 2` and the depressble valve stern 3. ln adapting my device for use, the customary cap is removed from the threaded valve sleeve Vand the signal device is substituted-in lieu thereof.

The signal device comprises a signal tube 4C having an air equalizng chamber e and an Figure l is a transverse i y p linteriorlfy kthreaded bell or head 5 that screws onto thethreade'd "valve sleeve 2 as shown,

and a packing washer is interposed betweenv the sleeve 'headAlto'` insureanlair tight f joint, f

fTl'he head 5' of the signal tube-is also provided with inner threads to receive 'a threaded `plug Twhich is'fashioned with a projecting boss 8 that engages'fiagainstthe end of the tire-'valve stemgfor the purpose of depresslng the stem and slightly opening V'thetire valve. yThus when the signal tube is 'screwed on the `valve'sleeve, the boss engages the stem 3, slightly", lopeninglthe tirev valve, vand air under"pressurefrom'thev tire tubefis perf mittedfto-"passthrough alateral port 9 ofthe y boss, and thencethroug'h-a longitudinal ypassage-10 in-Ythe'pluglto the equalizin'g pressure [chamber 4 of the 1signal tube.v y v At its lend opposite thel attaching-head 5,

-tliefsignaltube is4 fashionedwith a collar A1l fwhiclr is threadedbloth interiorly andy eXter1orly,jand-;its interior bore is substantially the samefas that ofVV the pressure chambery.'

The interior'threadsare adapted tofreceive "anexterioily threadedv'alveplug 121th'atis rigidlyfixedinfthe end ofthe s'ignal'tube' and provided with ak tapering or conicalpacking ,A 5 ring i 13" which 'frictionally engages' against a i Complementary "shoulderv 13;" within the f' sig-7 p nal tube at one end of tliepressurecham- 'lfm f. fj-b fpa Thevalve pl'u`g`1'2 has acentral opening or bore llleitjendingY therethrough", and the end ofthe tapered head is" adapted to receive a l,siginalvalve ,that norm'allycloses the opening `b`r passage L' The signall valve 16fisf-liollw arid rfits neatly within the 44pressure` chamber ".j'llf;and-acountersunk packing ring'l'? is-pro- 'vided for 1'the' valve ftliat is adaptedto-"fric- 'ptiorfallyl engage the -endfof,the 4'tapered "head f plug F l n I "ar'viedfatone e d'tfthe D st'ernf18 which passes-'through he belll lof thelvalve ,plugand'is offlessi diameter than the bore to afford vmeans for passage of air therethrough when the signal valve is removed from the'head or tapered end 15 of the plug.

At its opposite end the signal valve stem is provided with a xed head 19 which projects intoV the interior of the signal pipe 20. This signal pipe has an open end 21, with interior threads that screw upon the exterior threads 5 of theollar llofthe signal, tube and forms a' rigid istructure therewith: The head fl9 supports one end of a spring 22 that is interposed between the stein-head and an adjustable head 2'3earri'ed`fatone end'ofan adjusting sorew`24; 10Jth1f`eaddfin-the closedendtof the signal pipe and provided with an exterior: thurn'bknobv 25. The adjustable spring head 23 is guided in a hollow bushing 26 fixed withinthesigral pipe adjacent a ventopenng 27, andA a flat a face 28 on the exterior periphery ofthe bush"- ingprovidesa passage'from the interiorA of` .the signal 'pipeto thejport or Ventopening y27 and ythus to the atmosphere.

The tension ofthe spring23 maybe adjust- 20 ed by turning the thumb knob 25 and its screw 245 and thenthe .screw.mayrbe lookedinadjustediposition by the useof a-look nut 29 exteriorl of thefelosedend ofthe signal-.pipe Theftensionof thexspringisadj usted with rej ggflatioirgto,the;airpressure.Withinv the tire tube andthe pressure chamberA 4 o f the-signal, tube, itbeinggunderstoodthatthe pressurein thesef-twdtubes isrnormally: equalized. If the'pressure-ofair intthe tiretube is to be say 3o 55. pounds, then-thejtension ofthe spring 22 .is adjustedso that vthe spring-willvovercomefan air pressure. of' 5.4,l pounds. If.. the pressure inthe. tire l.tube and. ohamber falls below 55 pounds to pounds, thespring forces the.

' valves-16.rom'its seat againstthehead 155 and airV under pressure then;` passes through the bore 14,- through signal: pjipe `2O and the eonduit between the. bushing 26 and thesignal tubeg to andthrough-.the --po rt.2;7` with awhistling-noise. rPhe alarm.orwarningisthus sounded and.' Continuesuntil the tire is `deflated, l.or the air.v pressuref otherwise discontinuedA throughportf27v. Y

Havingthus .fully desoribedmyinVention,l

15.WhatvIe-laim' as` new-i and desire to secureby LettersPatent is 2;-

In a signal'deviee the Combination with .an attaehing tube. and Valve-openinglxineansL 'oar-y rdfthereby; ofaJ signal pipey 'forming :a eap and-.iseizurledv..-on* "the: tube,"r a. .Yalvesplug fixed inthetube andrpr'ovi'ded fa taperedhead, asigiialyalve.- in "the-tubehavili 

